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Irish frith-
← Proto-Celtic *writ- (inherited)
← Welsh wrth (cognate)
← Welsh gwrth- (mention)
← Proto-Indo-European *wert- (root)
← Proto-Indo-European *wert- (derived)
← Latin versus (cognate)
← Old Irish frith- (inherited)
← Old Irish fris·beir (mention)
← Old Irish fris·aicci (mention)
← Old Irish fris·indlea (mention)
← Old Irish fri (mention)

→ Welsh gwrth- (cognate)
→ Irish frithghníomhaíocht (affix)
→ Irish frithchaith (affix)
→ Irish frithchaitheamh (affix)
→ Irish fritocsain (affix)
→ Irish frithdhígeann (affix)
→ Irish frithbhuaic (affix)
→ Irish frithreo (affix)
→ Irish frithnód (affix)
→ Irish frithphápa (affix)
→ Irish frithbhuail (affix)
→ Irish frithshondas (affix)
→ Irish frithsciorrach (affix)
→ Irish frithbhaictéarach (affix)
→ Irish frithdhallta (affix)
→ Irish frithábhar (affix)
→ Irish frithchoirpín (affix)
→ Irish frithbheathach (affix)
→ Irish frithagra (affix)
→ Irish frithbhalla (affix)
→ Irish frithbheart (affix)
→ Irish frithéiligh (affix)
→ Irish frithéileamh (affix)
→ Irish frithfhórsa (affix)
→ Irish frithiarracht (affix)
→ Irish frithréabhlóid (affix)
→ Irish frithionsaigh (affix)
→ Irish frithionsaí (affix)
→ Irish frithmháirseáil (affix)
→ Irish frithmheáchan (affix)
→ Irish frithlogartam (affix)
→ Irish frithbhrú (affix)
→ Irish frithnimh (affix)
→ Irish frithpháirteach (affix)
→ Irish frithmholadh (affix)
→ Irish frithortha (affix)
→ Irish frithordú (affix)
→ Irish frithuillinn (affix)
→ Irish frith-Sheimíteachas (affix)
→ Irish frithghiúdachas (affix)